IntelBX80648I75820K
IntelBX80646I74790K

6 Cores, 12 Threads @3.3GHz, Haswell-E.
Release date: Q3 2014.

4 Cores, 8 Threads @4.0GHz, Haswell.
Release date: Q2 2014.

Real World Speed
Performance profile from 220,856 user samples
45,754 User Benchmarks
Best Bench: 102% Base clock 3.3 GHz, turbo 4.7 GHz (avg)
Worst Bench: 66% Base clock 3.3 GHz, turbo 1.2 GHz (avg)
Poor: 66% Great: 102%
SPEED RANK: 63rd / 1143
Gaming
Gaming 83%
Aircraft carrier
Desktop
Desktop 81%
Aircraft carrier
Workstation
Workstation 73%
Battleship
175,102 User Benchmarks
Best Bench: 99% Base clock 4 GHz, turbo 4.8 GHz (avg)
Worst Bench: 68% Base clock 4 GHz, turbo 0.8 GHz (avg)
Poor: 68% Great: 99%
SPEED RANK: 54th / 1143
Gaming
Gaming 85%
Aircraft carrier
Desktop
Desktop 87%
Aircraft carrier
Workstation
Workstation 63%
Destroyer
Effective Speed
Effective CPU Speed
83.2 % 84.9 % +2%
SC Mixed
Avg. Single Core Mixed Speed
105 Pts 122 Pts Faster single-core speed.
+16%
QC Mixed
Avg. Quad Core Mixed Speed
406 Pts 411 Pts +1%
MC Mixed
Avg. Multi Core Mixed Speed
829 Pts Much faster multi-core speed.
+31%
634 Pts
SC Mixed
OC Single Core Mixed Speed
128 Pts 136 Pts Slightly faster OC single-core speed.
+6%
QC Mixed
OC Quad Core Mixed Speed
507 Pts +1% 502 Pts
MC Mixed
OC Multi Core Mixed Speed
1018 Pts Much faster OC multi-core speed.
+43%
711 Pts
Market Share
Based on 12,818,692 CPUs tested.
Market Share
Market Share (trailing 30 days)
0.41 % 1.61 % Hugely higher market share.
+293%
Value
Value For Money
74.5 % 78 % +5%
User Rating
UBM User Rating
68 % 95 % Much more popular.
+40%
Price
Price (score)
$391 $365 Slightly cheaper.
+7%
Age
Newest
52 Months +4% 54 Months
TDP
Thermal Design Power (TDP)
140 Watts 88 Watts Much more energy efficient.
+37%
Cores
CPU Processing Cores
6 cores Much higher core count.
+50%
4 cores
Threads
CPU Processing Threads
12 threads Much higher thread count.
+50%
8 threads
Lithography
Manufacturing process
22 nm 22 nm
Base Clock
Base Clock Speed
3.3 GHz 4 GHz Faster base frequency.
+21%
Turbo Clock
Turbo Clock Speed
3.6 GHz 4.4 GHz Faster turbo frequency.
+22%
SC Int
Single Core Integer Speed
129 Pts 136 Pts Slightly faster single-core int speed.
+5%
SC Float
Single Core Floating Point Speed
129 Pts 137 Pts Slightly faster single-core fp speed.
+6%
QC Int
Quad Core Integer Speed
510 Pts +2% 502 Pts
QC Float
Quad Core Floating Point Speed
510 Pts +2% 501 Pts
MC Int
Multi Core Integer Speed
965 Pts Much faster multi-core int speed.
+43%
677 Pts
MC Float
Multi Core Floating Point Speed
1033 Pts Much faster multi-core fp speed.
+42%
726 Pts
Series
CPU Architecture
Haswell-E Haswell
Socket
Motherboard Socket
LGA2011-V3 FCLGA1150
Graphics
Integrated Graphics
None HD 4600
Launch Date
Launch Date
Q3'14 Q2'14
Cache
Cache
15 MB SmartCache 8 MB SmartCache
Instruction Set Extensions
Instruction Set Extensions
SSE4.2, AVX 2.0, AES SSE4.1/4.2, AVX 2.0
Recommended Price
Recommended Customer Price
$389.00 - $396.00 $339.00 - $350.00
Bus Speed
Bus Speed
0 GT/s 5 GT/s DMI2
Max Memory Size
Max Memory Size (dependent on memory type)
64 GB 32 GB
Memory Types
Memory Types
DDR4 1333/1600/2133 DDR3-1333/1600, DDR3L-1333/1600 @ 1.5V
Memory Channels
Max # of Memory Channels
4 2
Memory Bandwidth
Max Memory Bandwidth
68 GB/s 25.6 GB/s
Processor Graphics
Processor Graphics ‡
None Intel® HD Graphics 4600
Package Size
Package Size
52.5mm x 45.0mm 37.5mm x 37.5mm
Max # of PCI Express Lanes
Max # of PCI Express Lanes
28 16

More specs » More specs »
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The Intel Core i7-5820K is the cheapest of three (5820K,5930K,5960X) new Haswell-E prosumer/enthusiast processors. The 5820K sports six physical cores and twelve threads which allow for enormous processing throughput. Unfortunately Intel have somewhat handicapped the 5820K by setting its base clock at just 3.3 GHz, 0.7GHz lower than the class leading 4790K. Comparing the 4790K and 5820K shows that the cheaper i7-4790K is significantly faster at both single and dual threaded workloads. The additional two cores found in the 5820K are not relevant to general computing and as such the 5820K probably makes a better server rather than consumer proposition. The Haswell-E X99 architecture also requires DDR4 RAM which is currently far more expensive than DDR3. Overall the 5820K is a very expensive option and probably best avoided by the vast majority of consumers.  [Sep '14 CPUPro]

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The Intel Core i7-4790K, codenamed Devil's Canyon, is an upgraded 4770K, Intel's current flagship i7. The 4790K features an improved thermal interface which enables it to dissipate heat more efficiently than the 4770K. Comparing the 4770K and 4790K shows that stock performance has improved by 13% which is consistent with the base clock jump from 3.5 GHz to 4.0 GHz. OC performance remains unchanged. Comparing the 4790K and 4790 shows that at stock clocks the 4790K is around 16% faster which considering the small price difference makes the 4790K a far better choice. Previously Intel targeted the unlocked K versions at overclockers but with Devil's Canyon they have included VT-d on the K chip and this time it's squarely aimed at both power users and overclockers alike. Until the release of Broadwell in six months, the 4790K is the high end CPU of choice. [Jul '14 CPUPro]

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Processor Rankings (Price vs Performance) December 2018 CPU Rankings.

We calculate effective speed which measures real world performance for typical consumers. Effective speed is adjusted by current prices to yield a value for money rating which is geared towards gamers. Our calculated values are checked against thousands of individual user ratings. The customizable table below combines these factors to bring you the definitive list of top CPUs. [CPUPro]

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Group Test Results

  • Best user rated - User sentiment trumps benchmarks for this comparison.
  • Best value for money - Value for money is based on real world performance.
  • Fastest real world speed - Real World Speed measures performance for typical consumers.
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HDDRAMUSB
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